gemstone
Blue Agate
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, vibrant blue color from artificial dyeing, waxy to vitreous luster, and microcrystalline structure.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, vibrant blue color from artificial dyeing, waxy to vitreous luster, and microcrystalline structure.
Formation & geological history
Formed through the deposition of silica-rich groundwater in cavities of volcanic and metamorphic rocks over millions of years.
Uses & applications
Widely used in tumbled stones, jewelry, ornamental carvings, and holistic crystal collections.
Geological facts
Natural blue chalcedony exists, but intensely vibrant blue specimens like this are almost universally heat-treated or dye-enhanced.
Field identification & locations
Identified by its smooth tumbled feel, vitreous polish, and conchoidal fracture. Commonly sourced from Brazil and India.
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